Question on Hallicrafters HA-1 keyer - knobs

[Rinkie Pollack]

I agree...those are Heathkit knobs on the second unit, and the "chicken head" knobs on the rear are also not original.  Also, the phone jack on the back is also added.  Wonder what it connects to?
 
I also have 2 of these, and there are slight differences in the lettering.  I'm on the road, but will photograph them and send to you.  One of mine also has a red "h" Halli logo on the speaker part of the front panel.
 
I've had one of these in constant use for maybe 40 years, and never even changed a tube!  
 
A word of caution:  When keying significant voltage, for cathode keying for example, there is a simple RC circuit to be added across the keyed line.  The values vary based on the voltage and current being keyed.  If someone need the values, let me know.  The purpose is to protect the relay contacts.  The chart is in the manual
Ron K2RP

--- On Wed, 3/11/09, Larry Knapp <kc8jx at YAHOO.COM> wrote:

From: Larry Knapp <kc8jx at YAHOO.COM>
Subject: Re: Question on Hallicrafters HA-1 keyer - knobs
To: BOATANCHORS at LISTS.TEMPE.GOV
Date: Wednesday, March 11, 2009, 1:45 PM

Bob = Keyer two appears to have Heathkit knobs on it's front...plus some
'other' hamfest knobs on the back....as to the lettering...guess
that's just normal for multiple runs of a unit.   Larry, KC8JX

--- On Wed, 3/11/09, Robert Groh <rgroh at SWBELL.NET> wrote:


I have two Hallicrafters HA-1 keyers and each has a slightly different front
panel and type of knobs. I need some opinions on whether the HA-1 ever had the
type of knobs shown on the second keyer (description to follow). 

I put pictures of both  in a Picassa web album at:

< http://picasaweb.google.com/bob.groh/HA1_Keyer?feat=directlink >

Keyer #1 uses the familiar Hallicrafters knob of the 1960s such as used on the
SX-111 etc.  Keyer #2 uses a aluminum skirted knob like that used on the HT-32,
SX-101 et al. All the pictures of the HA-1 I have seen show knobs like Keyer #1.

On a lesser note, the lettering for 'T.O. Keyer' on Keyer #1 is in a
script lettering while Keyer #2 has a more normal script.

So my question - does anyone know if the HA-1 ever had aluminum skirted knobs
like #2 or (as I rather suspect) these were added by a previous owner.

Thanks to all for your time.

73
Bob Groh, WA2CKY





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